Mr Henare says it's "reprehensible" that Mr Ross was able to become a front bench MP, who until this week was seventh on the party list.

"I'm gobsmacked that he was made Deputy Whip, Chief Whip, all because somebody in the National Party - not the political wing, but the party - has thrown a blanket over him and said, 'It's all right bro, it'll go away'.

"That's the biggest thing. I think somebody's head will be rolling down Willis St very soon."

When asked if National will be able to distance themselves from their disgraced former MP, Mr Henare was unsure.

"My opinion is he's a nutjob, 100 percent. But here's the thing: they can deal with him, but now this other stuff has come up that belongs fair and square in front of the National Party."

Mr Henare says this week's chaos means many more politicians may have incriminating secrets.

"It's only isolated until the next person. We thought that David Benson-Pope was a weirdo, but who else was to come? Jami-Lee Ross."

Mr Benson-Pope is a former Labour MP who allegedly stuffed a tennis ball in a student's mouth.